检索结果-南通市图书馆

面向复杂场景的多通道慢速动目标稳健检测算法

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

电子与信息学报 2024年第5期46卷 2018-2027页

作者：刘昆贺雄鹏廖桂生余悦王麒凯西安电子科技大学雷达信号处理全国重点实验室西安710071

针对鲁棒主成分分析(RPCA)算法在多通道慢速地面动目标指示(GMTI)中存在的高虚警以及对通道误差敏感问题,该文提出一种数据重构与速度合成孔径雷达(VSAR)-RPCA联合处理的方法。首先,通过样本挑选与联合像素法完成通道间数据精确重构;然... 详细信息

针对鲁棒主成分分析(RPCA)算法在多通道慢速地面动目标指示(GMTI)中存在的高虚警以及对通道误差敏感问题,该文提出一种数据重构与速度合成孔径雷达(VSAR)-RPCA联合处理的方法。首先,通过样本挑选与联合像素法完成通道间数据精确重构;然后结合VSAR检测模式提出一种新的RPCA优化模型,通过采用交替投影乘子法对其进行求解得到空间频域的稀疏矩阵,进一步利用动目标与强杂波残余在空间频域通道的分布特性差异实现强杂波残余剔除与动目标检测;最后采用沿航迹干涉算法估计目标径向速度完成动目标重定位。相较于传统RPCA算法,所提算法在非理想强杂波背景下的虚警率显著降低。理论分析与实测实验验证了所提算法的有效性。

关键词：合成孔径雷达地面动目标检测鲁棒主成分分析数据重构

在线全文

学校读者我要写书评

暂无评论

一种侦干探多功能一体化微系统设计

系统工程与电子技术 2024年第3期46卷 868-881页

作者：肖国尧廖桂生柯华锋李帅全英汇西安电子科技大学电子工程学院陕西西安710071 西安电子科技大学雷达信号处理全国重点实验室陕西西安710071 中国空间技术研究院通信与导航卫星总体部北京100094

在无人机载、弹载综合电子应用领域,基于传统分立器件设计的信号处理系统面临日益突显的资源受限问题。因此,针对无人机载、弹载综合电子系统的多功能、小型化、高性能应用的迫切需求,提出一种侦干探多功能一体化信号处理微系统集成设... 详细信息

在无人机载、弹载综合电子应用领域,基于传统分立器件设计的信号处理系统面临日益突显的资源受限问题。因此,针对无人机载、弹载综合电子系统的多功能、小型化、高性能应用的迫切需求,提出一种侦干探多功能一体化信号处理微系统集成设计技术。基于三维堆叠等先进封装技术,将射频直采数模/模数转换器、可编程逻辑器件、处理器、大容量易失型存储器、非易失性存储器以及阻容等诸多元件进行共封装设计集成,构成可同时完成侦察、干扰、探测功能信号处理的微系统,并构建多功能应用场景,完成软硬件测试验证。该微系统不仅在体积、重量、性能、集成度等方面具有一定优越性,而且大大简化了信号处理系统的复杂电路设计,更便于系统的标准化、通用化和软件化,具有较大的应用前景。

关键词：多功能微系统异质异构三维堆叠侦干探一体化

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

一种自适应加速的多路径匹配追踪重建算法

西安电子科技大学学报 2024年第4期51卷 39-50页

作者：逯彦廖桂生王小鹏兰州交通大学电子与信息工程学院甘肃兰州730070 西安电子科技大学雷达信号处理全国重点实验室陕西西安710071

在压缩感知重建算法中,多路径匹配追踪算法能够通过搜索多个路径提升获得全局最优解的可能性,但产生的大量冗余路径会造成严重的性能损耗。针对此问题,提出了一种基于自适应加速的多路径匹配追踪重建算法。首先,该算法在路径分解时,通... 详细信息

在压缩感知重建算法中,多路径匹配追踪算法能够通过搜索多个路径提升获得全局最优解的可能性,但产生的大量冗余路径会造成严重的性能损耗。针对此问题,提出了一种基于自适应加速的多路径匹配追踪重建算法。首先,该算法在路径分解时,通过设置阈值门限控制生成的子枝点数量,优化了原算法平均分配路径数的策略,使相干性强的父枝点可以遍历更多的子枝点,限制相干性小的原子被分配到新的路径中;其次,利用首个路径产生的重建残差,设计了新的修剪准则对候选路径进行二次筛选,进一步减少冗余路径的生成,降低了计算支出;最后,在理论上推导了所提算法在理想状态下准确重建信号的有限等距性条件,给出了所提算法在有噪条件下准确重建信号的信噪比界限。仿真结果表明,在一维和二维信号的重建实验中,所提算法在保证较高的重建精度的前提下,与多路径匹配追踪算法相比,有效提升了重建效率。

关键词：压缩感知多路径匹配追踪相干性有限等距性

Method for array gain and phase uncertainties calibration based on ISM and ESPRIT

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2009年第2期20卷 223-228页

作者： liao Bin liao guisheng National Key Lab of Radar Signal Processing Xidian Univ. Xi'an 710071 P. R. China

A new method for array calibration of array gain and phase uncertainties, which severely degrade the performance of spatial spectrum estimation, is presented. The method is based on the idea of the instrumental sensors method （ISM）, two well-calibrated sensors are added into the original array. By applying the principle of estimation of signal parameters via rotational invariance techniques （ESPRIT）, the direction-of-arrivals （DOAs） and uncertainties can be estimated simultaneously through eigen-decomposition. Compared with the conventional ones, this new method has less computational complexity while has higher estimation precision, what＇s more, it can overcome the problem of ambiguity. Both theoretical analysis and computer simulations show the effectiveness of the proposed method.

关键词： array calibration array gain and phase uncertainties direction of arrival instrumental sensors method,estimation of signal parameters via rotationaJ invariance techniques.

在线全文

学校读者我要写书评

暂无评论

基于子阵波束设计的空时二维杂波抑制方法

雷达学报（中英文） 2024年第5期13卷 1061-1072页

作者：万福海许京伟廖桂生王伟伟西安电子科技大学雷达信号处理国家重点实验室西安710071 中国空间技术研究院西安分院西安710000

机载雷达接收端采用子阵处理时面临栅瓣杂波导致的复杂空时耦合分布,使主瓣波束方向存在多个由栅瓣杂波导致的检测性能凹口,目标检测性能恶化严重。针对此问题,该文首先分析了子阵处理中栅瓣杂波空时谱分布特性,并在此基础上提出了基于... 详细信息

机载雷达接收端采用子阵处理时面临栅瓣杂波导致的复杂空时耦合分布,使主瓣波束方向存在多个由栅瓣杂波导致的检测性能凹口,目标检测性能恶化严重。针对此问题,该文首先分析了子阵处理中栅瓣杂波空时谱分布特性,并在此基础上提出了基于接收子阵波束设计的空时二维杂波抑制方法。该方法采用重叠子阵构型方案,通过子阵方向图设计形成在子阵间栅瓣区域处的宽凹口,实现对子阵间栅瓣区域杂波的预滤波。进一步构建子阵级空时处理器,由于栅瓣杂波已经在子阵内完成预滤波,避免了栅瓣杂波在空时二维平面上的耦合扩散,从而提高了杂波抑制和动目标检测性能。仿真结果表明,所提方法显著改善了栅瓣杂波区的输出信杂噪比损失性能。

关键词：空时自适应处理重叠子阵栅瓣杂波抑制子阵方向图预滤波

Canonical framework for multi-channel SAR-GMTI

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2008年第5期19卷 923-928页

作者： Liu Congfeng liao guisheng National Lab of Radar Signal Processing Xidian Univ. Xi'an 710071 P. R. China

Synthetic aperture radar （SAR） systems have become an important tool for fine-resolution mapping and other remote sensing operations. The multi-channel SAR ground moving-target indication （GMTI） must process its data to produce not only the image of surveillance area but also the information of the ground moving-targets. The topic of moving-target detection in clutter has been extensively studied, and there are many methods that are used to detect moving targets, such as displaced phase center antenna （DPCA） method, along-track interfero-metric （ATI） phase, space-time adaptive processing （STAP）, or some other metrics. A canonical framework is proposed that encompasses all the multi-channel SAR-GMT methods, namely, DPCA and ATI. The statistical test metric for multi-channel SAR-GMTI is established in a simple form, via the definition of the complex central Wishart distribution, to deduce the statistics of the test metric, and the probability distribution of the test metric for multichannel SAR-GMTI has the complex central Wishart distribution of 1×1 case, namely the X^2 distribution. The theory foundation offers the possibility to construct the united multi-channel SAR-GMTI detector, and derives the constant false alarm rate （CFAR） detector tests for separating moving targets from clutter.

关键词： multi-channel SAR-GMTI canonical framework displaced phase center antenna along-track interferometrie statistics analysis.

Modified Omega-K algorithm for processing helicopter-borne frequency modulated continuous waveform rotating synthetic aperture radar data

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第3期26卷 476-485页

作者： Dong Li guisheng liao Yong liao Lisheng Yang Key Laboratory of Aerocraft Tracking Telemetering & Command and Communication Ministry of EducationChongqing University National Lab of Radar Signal Processing Xidian University

With appropriate geometry configuration, helicopter- borne rotating synthetic aperture radar （ROSAR） can break through the limitations of monostatic synthetic aperture radar （SAR） on forward-looking imaging. With this capability, ROSAR has extensive potential applications, such as self-navigation and self-landing. Moreover, it has many advantages if combined with the frequency modulated continuous wave （FMCW） technology. A novel geometric configuration and an imaging algorithm for helicopter-borne FMCW-ROSAR are proposed. Firstly, by per- forming the equivalent phase center principle, the separated trans- mitting and receiving antenna system is equalized to the case of system configuration with antenna for both transmitting and receiving signals. Based on this, the accurate two-dimensional spectrum is obtained and the Doppler frequency shift effect in- duced by the continuous motion of the platform during the long pulse duration is compensated. Next, the impacts of the velocity approximation error on the imaging algorithm are analyzed in de- tail, and the system parameters selection and resolution analysis are presented. The well-focused SAR image is then obtained by using the improved Omega-K algorithm incorporating the accurate compensation method for the velocity approximation error. FJnally, correctness of the analysis and effectiveness of the proposed al- gorithm are demonstrated through simulation results.

关键词： helicopter-borne rotating synthetic aperture radar(ROSAR) frequency modulated continuous wave (FMCW) improved Omega-K algorithm two-dimensional spectrum.

DOA estimation of wideband signals based on iterative spectral reconstruction

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2017年第6期28卷 1039-1045页

作者： Shun He Zhiwei Yang guisheng liao National Laboratory of Radar Signal Processing Xidian University Xi’an 710071 China Communication and Information Engineering Collage Xi’an University of Science and Technology Xi’an 710054 China

In order to solve the problem of coherent signal subspace method(CSSM) depending on the estimated accuracy of signal subspace, a new direction of arrival(DOA) estimation method of wideband source, which is based on iterative adaptive spectral reconstruction, is proposed. Firstly, the wideband signals are divided into several narrowband signals of different frequency bins by discrete Fourier transformation(DFT). Then, the signal matched power spectrum in referenced frequency bins is computed, which can form the initial covariance matrix. Finally, the linear restrained minimum variance spectral(Capon spectral) of signals in other frequency bins are reconstructed using sequential iterative means, so the DOA can be estimated by the locations of spectral peaks. Theoretical analysis and simulation results show the proposed method based on the iterative spectral reconstruction for the covariance matrices of all sub-bands can avoid the problem of determining the signal subspace accurately with the coherent signal subspace method under the conditions of small samples and low signal to noise ratio(SNR), and it can also realize full dimensional focusing of different sub-band data, which can be applied to coherent sources and can significantly improve the accuracy of DOA estimation.

关键词： direction of arrival(DOA) wideband source coherent source minimum variance spectral

Space-borne antenna adaptive anti-jamming method based on gradient-genetic algorithm

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2007年第3期18卷 469-475页

作者： Tao Haihong liao guisheng Yu Jiang National Key Lab. of Radar Signal Processing Xidian Univ. Xi'an 710071 P. R. China

A novel space-borne antenna adaptive anti-jamming method based on the genetic algorithm （GA）, which is combined with gradient-like reproduction operators is presented, to search for the best weight for pattern synthesis in radio frequency （RF）. Combined, the GA＇s the capability of the whole searching is, but not limited by selection of the initial parameter, with the gradient algorithm＇s advantage of fast searching. The proposed method requires a smaller sized initial population and lower computational complexity. Therefore, it is flexible to implement this method in the real-time systems. By using the proposed algorithm, the designer can efficiently control both main-lobe shaping and side-lobe level. Simulation results based on the spot survey data show that the algorithm proposed is efficient and feasible.

关键词： space-borne antenna genetic algorithm (GA) gradient-like anti-jamming pattern synthesis.